72539543 has 2 divisors, whose sum is σ = 72539544. Its totient is φ = 72539542.

The previous prime is 72539521. The next prime is 72539567. The reversal of 72539543 is 34593527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72539543 - 2²⁶ = 5430679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72539497 and 72539506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72539503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36269771 + 36269772.

It is an arithmetic number, because the mean of its divisors is an integer number (36269772).

Almost surely, 2^72539543 is an apocalyptic number.

72539543 is a deficient number, since it is larger than the sum of its proper divisors (1).

72539543 is an equidigital number, since it uses as much as digits as its factorization.

72539543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 38.

The square root of 72539543 is about 8517.0149113407. The cubic root of 72539543 is about 417.0533413852.

The spelling of 72539543 in words is "seventy-two million, five hundred thirty-nine thousand, five hundred forty-three".